Ken,
Are some of the UL crowd prepared...sure. However, most of the people I end up sharing something with are those who have made a determination it is best to go with less and depend on the kindness of others when things go wrong.
I do not determine whether they are hard core UL or just every day UL/Light. Most of my contacts with these people have been with those that are unprepared for conditions and the what can happens. On the whole, they do not have workable maps (less than Tom Harrison Cartography), sufficient first aid kits, clothes for conditions that can happen, unaware of the latest forecast and not all of the 10 essentials in their packs.
I go light, unless I am doing a forest service volunteer patrol. My day hike base pack weight is ~5 pounds.
